John cheistiansen



(No Model.)

J. CHRISTIAN'SEN BENDHTG MACHINE. N0. 261.429. Patented July 13, 1882.

lllllllllllllllllHllllllllHlllllll IHHHHIINIIlillllllllllllil! UNITED STATES PATENT O FICE,

JOHN GHRISTIANSEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE UNION FOUNDRY AND PULLMAN OAR WHEEL WORKS, ()F SAME PLACE.

QBENDING-MACHINE.

SPECIFICATION forming part of. Letters Patent No. 261,429, dated July 18, 1882.

Application filed October 3, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN CHRISTIANSEN, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Bending-Machines; and I hereby declare the following to be a full, clear, and

exact description thereof, reference being bad to the accompanying drawings, of which-- to Figure 1 is afront elevation of my machine; Fig. 2, an end elevation of the same, and Fig. 3 a side view of the device formed by the machine.

In the construction of cable street-railways (by which term is meant those street-railways in which the cars are propelled by means of an endless cable below the track-level, moved by stationary en gincs at different points of the route) a device is used for supporting the track and all attendant parts, which device is technicallycalled a yoke. The main part of this yoke is formed of a T-bar bent to the shape shown in Fig. 3.

My invention relates to a machine for forming this part of the yoke from a common T- bar, the object being to save time and expense in the manufacture, and also to secure greater uniformity in the results than can beobtained by hand; and it consists in the general combination of parts by which the bending is effected, all as hereinafter more fully set forth. In the drawings, A is the frame of the machine, consisting of a heavy iron plate at the rear of the operating parts, and also below them. A

B B are uprights secured to the frame A, and O 0 guides, also secured to the frame. These guides project downward from the lower ends of the uprights in a direction inclining outward, and are secured at their lower ends by means of set-screws 0), connecting them to arms a, projecting forward from the frame A. If necessary, they may be "strengthened by means of buck-stays. i D is a cross-head sliding up and down in guides in the uprightsB, being moved by any suitable mechanismas, for example, the rack and pinion t 8, together with the necessary gearing, and a clutch or other suitable device 50 for reversing the direction of motion, all constructed in any well-known manner, whereby the cross-head D,with its attendant parts, may

be raised or lowered at will. If preferred, a steam cylinder, directly on top of the machine, with the necessary reversing mechanism, may 5 5 be employed for moving the cross-head.

E is the yoke-former, consisting of a heavy iron form securely bolted to the groundwork of the frame A. The upper surface of this former has the precise shape of the yoke to be formed, and the sole object .of all the other mechanism is to bend the red-hot T-bar down over it.

F F are two pitmen pivoted to the crosshead D and depending therefrom, and each ter* minatin g in three rollers, one large one, G, havin g a grooved periphery to fit over the flange of the T-bar, and adapted to roll downward over the said bar and thus bend it over the form, and two smaller ones, H, traveling on the inner faces of the guides 0, whereby the roller G, in its descent, is borne hard upon the bar.

The guides 0, from the point r to their lower ends, are each divided into two parts, q and 19, between which the roller G travels.

The rollers G and H are set upon a common axle, o, in the lower end of the pitman, but revolve independently of each other,-whereby they are enabled to turn in contrary directions in traveling upon the opposite planes formed by the That and the guide 0.

To operate the machine,the cross-head,with the pitmen and rollers, is raised and the redhot T-bar inserted under the rollers, between the parts q and p of the guides 0 over the top of the former E, in the position indicated by the dotted lines in Fig. 1. The clutch is then reversed, causing the rollers G to bear down upon the bar.

It will be noted that the guides G and former E are nearly parallel, but that from apoint, u, even with the top of the former the sides of the guides become more nearly perpendicular. This construction is not absolutely necessary, but it is preferable, for, as the roller Gr here bears almost vertically upon the bar, the latter will not onlyshapeitself to the top of the former without the aid of guides, but better results are olltained by giving the rollers a little lateral play at this point. Hence the friction at- 10c tendant upon guides may here be avoided.

The rollers m at the base of the machine serve to lessen the friction at the finish,when the bar, under a heavy do wnward pressure, is drawn inward into the bend at the base of the former.

I is a horizontal projection upon the frame A, extending over the top of the former. A wedge inserted under it holds the bar to the top of the former as the rollers descend.

The guides Oshould be providcdwith means of adjustment, in order to bring them closer to or farther from the former E, according to the thickness of the metal of the T-bars. This adjustment may be effected by means of the setscrews 1;, before referred to, in connection with the device shown at lfor connecting the guides to the frame A. This device consists simply of an eccentric bolt, by turning which the position of the guide is shifted.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination,with the depending pit- '20 2. Jointly with the rolls G and H, having 25 common axes, thehinged and adjustable guides 0 and former E, as and for the purpose set forth.

JOHN GHRISTIANSEN.

In presence of- P. (J. DYRENFORTH WM. H. DYRENFORTH. 

